US4062653A - Powder flow control device for growing Verneuil crystals - Google Patents

Powder flow control device for growing Verneuil crystals Download PDF

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Publication number
US4062653A
US4062653A US05/725,672 US72567276A US4062653A US 4062653 A US4062653 A US 4062653A US 72567276 A US72567276 A US 72567276A US 4062653 A US4062653 A US 4062653A
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US
United States
Prior art keywords
sphere
verneuil
screen
powder
growing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US05/725,672
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English (en)
Inventor
Richard Falckenberg
Ali Abd el Wahid
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Siemens AG
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Siemens AG
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Filing date
Publication date
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    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B11/00—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method
    • C30B11/04—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method adding crystallising materials or reactants forming it in situ to the melt
    • C30B11/08—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method adding crystallising materials or reactants forming it in situ to the melt every component of the crystal composition being added during the crystallisation
    • C30B11/10—Solid or liquid components, e.g. Verneuil method
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
    • Y10T117/10—Apparatus
    • Y10T117/1024—Apparatus for crystallization from liquid or supercritical state
    • Y10T117/1028—Crucibleless apparatus having means providing movement of discrete droplets or solid particles to thin-film precursor [e.g., Verneuil method]

Definitions

  • the invention relates to devices for control of powder supply in a crystal growing apparatus.
  • Verneuil crystals are produced by supplying a powder to a crystalline material in a flame which melts the powder and directs the melt to a seed crystal being impinged upon by the flame.
  • the seed crystal is melted at its top or upper surface by the impinging flame and is gradually withdrawn from the region of the flame while, simultaneously, a supply of crystalline material is fed to the melt so that the material progressively crystallizes out of the melt onto the seed crystal.
  • the newly formed, predominantly mono-crystalline material forms the desired crystal as an elongation of the seed crystal.
  • a rotating sphere is arranged for rotation about a horizontal axis in a tube connecting a supply container to a powder funnel and above an oscillatable screen in an apparatus for growing crystals as according to the Verneuil process.
  • the sphere is rotated about its horizontal axis by a motor drive at a rate adapted to transport a desired volume of powder to the vertically oscillating screen.
  • the sphere fits the tube so that only a small gap is left about its periphery. This sphere keeps oscillations of the air column from affecting the flow of powder from the supply container.
  • the sphere may either serve as a lower closure of the supply container or it can be located between first and second screens conventionally provided in a Verneuil apparatus. Vertical grooves in the surface of the sphere may be used to increase powder flow.
  • FIG. 1 is a side, sectional view, partially schematic, through a device in accordance with the invention.
  • FIG. 2 is an enlarged elevational view, partly in section, through the portion of the device of FIG. 1 in which the conveyor sphere is mounted.
  • FIG. 1 An apparatus for growing crystals according to Verneuil is shown at 1 in FIG. 1.
  • the apparatus 1 comprises a series of powder flow control devices arranged along a vertical axis.
  • a funnel-shaped supply container 2 is fitted with a first screen 4 at its bottom or constricted end.
  • An oscillator drive 6 drives the supply container 2 and the first screen 4 in horizontal oscillations.
  • a hollow tube 8 is connected beneath the supply container 2 by a flexible sleeve 10 which isolates the tube 8 from the oscillations of the supply container 2.
  • the sleeve 10 seals the container 2 to the tube 8 so that powder cannot escape and foreign material cannot enter.
  • a conveyor sphere 12 is arranged on a horizontal shaft 14 and centered in the interior of the tube 8.
  • a motor drive 18 selectively rotates the shaft 14 and the conveyor sphere 12 attached thereto, for rotation of the surface of the sphere 12 parallel to a conveyance direction 16 vertically through the tube 8.
  • An annular, ring-shaped gap is left between the sphere 12 and the interior of the tube 8 in the horizontal plane.
  • the gap 19 and features of the surface of the sphere 12 are dimensioned so that no powder collects above the sphere 12. Once the size and surface parameters are fixed, however, the transport capability can be varied within limits by variation in the speed of rotation of the sphere 12 on the axle 14, as induced by the drive 18.
  • the lower end of the tube 8 is connected by a further moveable sleeve to a further section of tubing carrying on a lower portion thereof a second screen 20 which is driven in vertical oscillations by an oscillator drive 24.
  • the second screen 20 has a very fine mesh to filter and distribute the powder falling through the apparatus.
  • Vertical oscillations of the air column above the screen 20 are prevented by the sphere 12 from interfering with the passage of powder through the first screen 4 from the supply container 2.
  • Powder passing through the screen 20 passes through the funnel 26 therebelow and into a hydrogen-oxygen flame 22.
  • the oxygen and hydrogen are respectively provided through supply tubes 28, 30.
  • the oxygen is admitted to the powder flow passage about the funnel 26, so that some of the powder is entrained therein.
  • FIG. 2 shows an enlarged view of the center of the tube 8 wherein the conveyor sphere 12 is mounted for rotation.
  • Powder 32 falls through the upper portion of the tube 8 from the supply container 2 onto and about the surface of the sphere 12.
  • Rotation of the sphere 12 about the shaft 14 conveys powder through substantially one half of the ring-shaped gap 19 about the sphere to fall as powder 34 through the tube 8.
  • Grooves 36 are provided in the surface of the sphere 12 to extend about the periphery of the sphere 12 in a vertical direction, corresponding to parallels of latitude on a globe. Thus the grooves 36 are circular, with their centers lying on the shaft 14.
  • the form, number, and size of the grooves 36 determines the volume of powder which may be conveyed by the sphere 12.
  • the gap 19 between the sphere 12 and the tube 8 can be kept especially small, thereby insuring isolation of the supply container 2 from oscillations of air induced by the screen 20.
  • a sphere 12 having a diameter of 100mm was favorably provided with grooves 36 each having a semicircular cross-section of radius of about 3mm at intervals of 20mm along the axis of the sphere.
  • the gap width between the ungrooved portions of the sphere surface and the tubular part 8 was about 0.5mm.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
US05/725,672 1975-09-25 1976-09-22 Powder flow control device for growing Verneuil crystals Expired - Lifetime US4062653A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2542886A DE2542886B2 (de) 1975-09-25 1975-09-25 Vorrichtung zur Pulverförderung bei der Kristallzüchtung nach Verneuil
DT2542886 1975-09-25

Publications (1)

Publication Number Publication Date
US4062653A true US4062653A (en) 1977-12-13

Family

ID=5957458

Family Applications (1)

Application Number Title Priority Date Filing Date
US05/725,672 Expired - Lifetime US4062653A (en) 1975-09-25 1976-09-22 Powder flow control device for growing Verneuil crystals

Country Status (9)

Country Link
US (1) US4062653A (fr)
JP (1) JPS5241175A (fr)
BE (1) BE846586A (fr)
CH (1) CH600945A5 (fr)
DE (1) DE2542886B2 (fr)
FR (1) FR2325581A1 (fr)
GB (1) GB1501314A (fr)
IT (1) IT1068350B (fr)
NL (1) NL7610486A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8737043B2 (en) 2011-03-10 2014-05-27 Ericson Manufacturing Co. Electrical enclosure
CN106276306A (zh) * 2016-08-28 2017-01-04 董亚伦 一种干粉砂浆防离析装置
US10844512B2 (en) 2018-10-24 2020-11-24 Boram Holdings Co., Ltd. Method for manufacturing synthetic gemstone

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2273923B (en) * 1993-01-04 1996-09-25 Glaverbel Apparatus for the distribution of particulate material upon a surface
DE202008012645U1 (de) 2008-09-23 2008-12-24 Wegen Gmbh Waagenkompensator

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1505723A (en) * 1923-01-26 1924-08-19 United Eng Foundry Co Rotary feed member
US1855214A (en) * 1931-07-10 1932-04-26 Vanderbilt Co R T Soap dispenser
US2591561A (en) * 1943-04-28 1952-04-01 Elgin Nat Watch Co Apparatus for producing refractory rods
US2737319A (en) * 1952-12-16 1956-03-06 Western Electric Co Apparatus for feeding granular materials
US3086850A (en) * 1959-06-17 1963-04-23 Itt Method and means for growing and treating crystals
US3221938A (en) * 1964-12-18 1965-12-07 Oxy Dry Sprayer Corp Powder spraying apparatus
FR1474902A (fr) * 1966-02-11 1967-03-31 Comp Generale Electricite Distributeur de poudre
US3511614A (en) * 1967-06-16 1970-05-12 Little Inc A Heat sensitive fuel controlled verneuil process
US3519394A (en) * 1965-02-10 1970-07-07 Ugine Kuhlmann Apparatus for the fabrication of a synthetic ruby
US3620423A (en) * 1968-07-23 1971-11-16 Golden Wonder Ltd Apparatus for distributing powder
US3917459A (en) * 1973-05-16 1975-11-04 Siemens Ag Apparatus for the production of Verneuil crystals
US3960503A (en) * 1974-12-27 1976-06-01 Corning Glass Works Particulate material feeder for high temperature vacuum system

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1505723A (en) * 1923-01-26 1924-08-19 United Eng Foundry Co Rotary feed member
US1855214A (en) * 1931-07-10 1932-04-26 Vanderbilt Co R T Soap dispenser
US2591561A (en) * 1943-04-28 1952-04-01 Elgin Nat Watch Co Apparatus for producing refractory rods
US2737319A (en) * 1952-12-16 1956-03-06 Western Electric Co Apparatus for feeding granular materials
US3086850A (en) * 1959-06-17 1963-04-23 Itt Method and means for growing and treating crystals
US3221938A (en) * 1964-12-18 1965-12-07 Oxy Dry Sprayer Corp Powder spraying apparatus
US3519394A (en) * 1965-02-10 1970-07-07 Ugine Kuhlmann Apparatus for the fabrication of a synthetic ruby
FR1474902A (fr) * 1966-02-11 1967-03-31 Comp Generale Electricite Distributeur de poudre
US3511614A (en) * 1967-06-16 1970-05-12 Little Inc A Heat sensitive fuel controlled verneuil process
US3620423A (en) * 1968-07-23 1971-11-16 Golden Wonder Ltd Apparatus for distributing powder
US3917459A (en) * 1973-05-16 1975-11-04 Siemens Ag Apparatus for the production of Verneuil crystals
US3960503A (en) * 1974-12-27 1976-06-01 Corning Glass Works Particulate material feeder for high temperature vacuum system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8737043B2 (en) 2011-03-10 2014-05-27 Ericson Manufacturing Co. Electrical enclosure
US9420710B2 (en) 2011-03-10 2016-08-16 Ericson Manufacturing Co. Electrical enclosure
US10008352B2 (en) 2011-03-10 2018-06-26 Ericson Manufacturing Co. Electrical enclosure
CN106276306A (zh) * 2016-08-28 2017-01-04 董亚伦 一种干粉砂浆防离析装置
US10844512B2 (en) 2018-10-24 2020-11-24 Boram Holdings Co., Ltd. Method for manufacturing synthetic gemstone

Also Published As

Publication number Publication date
IT1068350B (it) 1985-03-21
NL7610486A (nl) 1977-03-29
FR2325581A1 (fr) 1977-04-22
DE2542886B2 (de) 1978-09-21
DE2542886A1 (de) 1977-03-31
JPS5241175A (en) 1977-03-30
FR2325581B1 (fr) 1978-11-03
DE2542886C3 (fr) 1979-05-23
BE846586A (fr) 1977-01-17
GB1501314A (en) 1978-02-15
CH600945A5 (fr) 1978-06-30

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